var createError = require('http-errors');
var express = require('express');
var path = require('path');
var fs = require('fs');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
const session = require('express-session')
const RedisStore = require('connect-redis')(session)

var blogRouter = require('./routes/blog');
var userRouter = require('./routes/user');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');

// 日志处理
const env = process.env.NODE_ENV
if (env === 'develop') {
  // 开发、测试环境
  app.use(logger('dev'));
} else {
  // 线上环境
  const logFileName = path.join(__dirname, 'logs', 'access.log')
  const writeStream = fs.createWriteStream(logFileName, { flags: 'a' })
  app.use(logger('combined', { stream: writeStream }));
}

app.use(express.json());
app.use(express.urlencoded({ extended: false }));

app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

// 使用 redis 存储session
const redisClient = require('./db/redis')
const sessionStore = new RedisStore({
  client: redisClient
})
// 配置 session
app.use(session({
  name: 'userId',
  secret: 'WJiol#23123_',
  cookie: {
    // path: '/',   // 默认配置
    // httpOnly: true,  // 默认配置
    maxAge: 12 * 60 * 60 * 1000
  },
  store: sessionStore
}))

// /' 路径 对应的路由器应该放在最后面，因为匹配到 '/' 路径时，也会进入到其他路由器中
app.use('/api/blog', blogRouter);
app.use('/api/user', userRouter);

// 测试 session
app.get('/test/session', function (req, res, nexe) {
  if (!req.session.num) {
    req.session.num = 1
  } else {
    req.session.num++
  }
  res.send('num:' + req.session.num)
})

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'develop' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;
